Solar buffer
simple Solar buffer
simple| This
function block realizes a simple solar control for
charging a single buffer. Either a pump via
switching hysteresis (digital) or a pump with analog or
PWM control can be used. The pump is switched on when the solar temperature is higher than the buffer temperature by the Hysteresis on and both the buffer and solar temperatures are below their maximum values. With the pump switched on, the speed is controlled via a P controller (Gain) so that the buffer temperature is held as setpoint; the result is present at the output Pump analog 0-100%. The pump is switched off again when the difference falls below the Hysteresis off or the buffer or solar temperature reaches its maximum value. |
Inputs |
||
| PU | Temp. buffer bottom | Temperature buffer bottom. |
| SO |
Temp. solar |
Temperature solar (collector). |
Outputs |
||
| PD |
Pump
digital |
Pump digital on/off. |
| PA |
Pump
analog 0-100% |
Pump analog. As an alternative to
control via switching hysteresis, a pump with
analog control can be used at this output. |
Parameters |
||
| Solar
max. |
Maximum temperature solar. If the temperature exceeds this value, the pump is switched off even if the buffer temperature has not been reached. | |
| Buffer
max. |
Switch-off temperature buffer. If the
buffer temperature exceeds this value, the solar pump is switched off. |
|
| Hysteresis
on |
Difference between solar and buffer
at which the control becomes active. |
|
| Hysteresis
off |
Difference between solar and buffer at which the control becomes inactive. | |
| Gain | Control setting; the higher the value, the faster the analog output changes with a change in temperature. | |